I am creating a collection view with the same width as the view, and a set height. For the cells inside the collection view, I want there two be two columns, with each cell being half the width of the screen. I designed this in the storyboard on an iPhone 8, and it looks fine. When i view it on an iPhone 8 plus, there is some extra padding on the left of the right column as shown below.
I want to get rid of that padding. I've tried this by writing the code below, but it did not seem to work
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
// Place content into hashtag cells
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "hashtagCell", for: indexPath) as! TrendingTagsCollectionViewCell
cell.delegate = self
cell.hashtagText = hashtags[indexPath.row]
cell.frame.size.width = view.frame.width / 2
return cell
}
extension GlobeTableViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 0.0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 0.0
}
}
Related
Hello i am creating App using Swift and i am creating grid view using Collectionview but i got different output on different devices here is the code for populating and setting layout of collectionview
var imageArray = [UIImage]()
var nameArray = ["General album","Videos","New album","Custom name album"]
private var numberOfItemsInRow = 2
private var minimumSpacing = 10
private var edgeInsetPadding = 10
extension GalleryViewController:UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout{
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return imageArray.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! GalleryCollectionViewCell
cell.imgView.image = imageArray[indexPath.row]
cell.lblName.text = nameArray[indexPath.row]
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
let inset = UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20)
edgeInsetPadding = Int(inset.left+inset.right)
return inset
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return CGFloat(minimumSpacing)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return CGFloat(minimumSpacing)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let width = (Int(UIScreen.main.bounds.size.width) - (numberOfItemsInRow - 1) * minimumSpacing - edgeInsetPadding) / numberOfItemsInRow
return CGSize(width: width, height: width)
}
}
from this code i am not able to achive exact grid layout so i tried below code
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let padding: CGFloat = 50
let collectionViewSize = collectionView.frame.size.width - padding
return CGSize(width: collectionViewSize/2, height: collectionViewSize/2)
}
I got this code from this link:
Display UICollectionView with 2 columns of equal size square cells
but i am not able to achive exact grid layout its changed based on device i am sharing two screen shot
iPhone 11 Max Pro screen shot:
iPhone 7 Screen Shot:
in iphone 7 i am getting layout perfect but on iPhone 11 Max Pro i am not getting perfect any solution? than please help me
Add the following code in the "viewDidLoad" method of your controller:-
collectionView.delegate = self
collectionView.dataSource = self
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .vertical //.horizontal
layout.minimumLineSpacing = 10
layout.minimumInteritemSpacing = 10
collectionView.setCollectionViewLayout(layout, animated: true)
Add only "insetForSectionAt" and "sizeForItemAt" these methods to handle the layout of your collection View. As I have modified the delegate and data source you can directly use it.
extension GalleryViewController:UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout{
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return imageArray.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! GalleryCollectionViewCell
cell.imgView.image = imageArray[indexPath.row]
cell.lblName.text = nameArray[indexPath.row]
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 10.0, left: 10.0, bottom: 10.0, right: 10.0)//here your custom value for spacing
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let lay = collectionViewLayout as! UICollectionViewFlowLayout
let widthPerItem = collectionView.frame.width / 2 - lay.minimumInteritemSpacing
return CGSize(width:widthPerItem, height: widthPerItem)
}
}
Im assuming your issue here is that the horizontal spacing is too much in iphone 11 Pro Xmax . The reason to this is that the iphone xsMax screen is much larger than the iphone 7 Screen. Take a look at this link below it has all the IOS screen sizes and widths and pixels which may come in handy.
https://www.paintcodeapp.com/news/ultimate-guide-to-iphone-resolutions
As for your issue , the width of the device is different from iphone 7 to iphone 11 so the issue is you are setting the minimumSpacing ,width , height for an iphone 7 screen and you need to use constraints for the sides and use the constarints to adjust the widths , and heights and the spacing needs to be edited so that it is similar to all screens .
The chances of it coming perfectly equal in all your screens are minor but you can do much better with this approach .
I am trying to create UICollectionView Horizontal scrolling (like a top menu single row) with cell label. Here, I need to implement my label content different length so based on different length cell label should auto adjust Its width. I am using storyboard for my design.
Below my code
extension CameraViewController: UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return self.items.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: Constants.reuseID, for: indexPath) as! cameraModeCollectionViewCell
cell.cameraMode.text = self.items[indexPath.item]
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
print("You selected cell #\(indexPath.item)!")
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsetsMake(0, 40, 0, 40)
}
}
Current output Iam getting
Implement UICollectionViewDelegateFlowLayout's method collectionView(_:layout:sizeForItemAt) and calculate the width of collectionViewCell based the width of text that you're populating the label with.
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let text = self.items[indexPath.row]
let cellWidth = text.size(withAttributes:[.font: UIFont.systemFont(ofSize: 14.0)]).width + 10.0
return CGSize(width: cellWidth, height: collectionView.bounds.height)
}
In the above code I've used self.items[indexPath.row] as the source of text. 10.0 is the extra padding added to the cell.
In case the items array is optional, do unwrap the value of self.items[indexPath.row] before using.
Step 1 : Find the width of the text that has to be placed in each cell. This can be found using below function
string.size(withAttributes:[.font: UIFont.systemFont(ofSize: 14.0)]).width
Using this function we can find width of dynamic text during run time.
Step 2: Set the size of each cell using the width that we found in Step 1. Size of each cell is set using below delegate
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
Combining Step 1 and 2, we can get a collection view which has cell width as per text width that is placed inside it.
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let text = self.items[indexPath.row] // getting text of each index
let cellWidth = text.size(withAttributes:[.font: UIFont.systemFont(ofSize: 14.0)]).width + 10.0 // getting width of each text + extra margin of 10
return CGSize(width: cellWidth, height: 40.0) // height as per your requirement
}
I want to set Collection cell. One is always center. And Other Two left Corner of Collection View. And I want to know indexpath of Center Item. Initially When a data load First cell is always on Center. Please See Image.
Here is my try but not get Success. Please Help me or Suggest Any Another Way.
extension AudioViewController : UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout{
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 10
}
// make a cell for each cell index path
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
// get a reference to our storyboard cell
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "AudioCollectionViewCell", for: indexPath) as! AudioCollectionViewCell
cell.backgeoundImage.image = UIImage(named :"play.png")
return cell
}
*
#objc(collectionView:layout:insetForSectionAtIndex:) func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets{
return UIEdgeInsetsMake(0, 100, 0, 0)
}
*
I am trying to edit the width of the cell so that no matter what screen size, I will have score1.count cells in a row. The code I am using for my Collection View is the following:
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return self.items.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath as IndexPath) as! MyCollectionViewCell
cell.myLabel.text = String(self.items[indexPath.item])
return cell
}
This is the function targeting the width of the cell.
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout,sizeForItemAt indexPath: IndexPath) -> CGSize {
let size = Int(self.view.frame.size.width)/(score1.count + 1)
return CGSize(width: CGFloat(size), height: 80)
}
I have spent many hours looking at different sources and trying different things, but the collection view never has the right number of cells. One idea is that it may be because I have the cell size set in auto layout but whenever I go to change it xcode crashes. Any ideas on bypassing the auto layout? Or how to change the auto layout?
Thanks!
try this
extension YourViewController : UICollectionViewDelegateFlowLayout{
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let rowItems:CGFloat = 4
let padding:CGFloat = 2
let width = (collectionView.bounds.width / rowItems) - padding //Change width as per your requirement
let height = collectionView.bounds.height - (2 * padding)//Change height as per your requirement
return CGSize(width: width, height: height)
}
}
You can change your sizeForItemAtIndexPath as. You can assign size of cell after substracting margin and diving by number of cell.
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout,sizeForItemAt indexPath: IndexPath) -> CGSize {
let size = (Int(collectionView.bounds.width) - (score1.count+1)*5) /(score1.count) // 5 is the margin you want to keep in between 2 cells
return CGSize(width: CGFloat(size), height: 80)
}
Do let me know if you have any queries. I would try and clarify.
I'm trying to create a custom cell with top,left,bottom spacing for each cell. Is there any collection view data source methids, inorder to specify the cell insets in each indexpath.
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: block.blockCellIdentifier, for: indexPath) as! BlockBaseClass
let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
layout.minimumLineSpacing = 10
return cell
}
But the layout is not working, inside the cellforitemAt indexpath.
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets
{
return UIEdgeInsetsMake(5.0,5.0,5.0,5.0) // top, left, bottom, right
}
By the help of this delegate function you can:
override func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionat section: Int) -> UIEdgeInsets {
return UIEdgeInsetsMake(50, 50, 15, 50)
}
This UIEdgeInsetsMake ( CGFloat top,CGFloat left,CGFloat bottom,CGFloat right);